aam Upgrades - front Aam 9 1 4 Axle - Photo 04

The front AAM 91⁄4 axle found its way under Dodge heavy-duty trucks in 2003. On our Ram 3500 it isn’t bad in stock form. The axleshafts are 33-spline 1.37-inch diameter, and as of 2012 it now uses a massive 1555 series U-joint, but we still opted for some Dynatrac upgrades.